6.3 Fuse Specifications
6.3.1 Fuses
It is recommended to use fuses and/or circuit breakers on
the supply side as protection in case of component break-
down inside the frequency converter (first fault).
NOTE
This is mandatory in order to ensure compliance with IEC
60364 for CE or NEC 70 for UL.
WARNING
Personnel and property must be protected against the
consequence of component break-down internally in the
frequency converter.
Branch circuit protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines
etc., must be protected against short-circuit and over-
current according to national/international regulations.
NOTE
The recommendations given do not cover Branch circuit
protection for UL.
Short-circuit protection
Danfoss recommends using the fuses/circuit breakers
mentioned below to protect service personnel and
property in case of component break-down in the
frequency converter.
6.3.2 Recommendations
WARNING
In case of malfunction, not following the recommendation
may result in personnel risk and damage to the frequency
converter and other equipment.
and
list the recommended fuses and
circuit breakers which have been tested.
If fuses/circuit breakers according to recommendations are
chosen, possible damages on the frequency converter will
mainly be limited to damages inside the unit.
6.3.3 CE Compliance
Fuses or circuit breakers are mandatory to comply with IEC
60364. Danfoss recommend using a selection of the
following.
The fuses in
and
are suitable for use on
a circuit capable of delivering 100,000 Arms (symmetrical),
480 V depending on the frequency converter voltage
rating. With the proper fusing the frequency converter
short circuit current rating (SCCR) is 100,000 Arms.
Frame Size
Power [kW]
gG
J1
0.37-1.1
10
1.5
2.2
J2
3.0
25
4.0
5.5
J3
7.5
32
J4
11-15
50
J5
18.5
80
22
J6
30
160
37
45
J7
55
250
75
Table 6.4 CE Fuse, 380-480 V, Frame Sizes J1-J7
The circuit breakers in
are suitable for use on a
circuit capable of delivering 35,000 Arms (symmetrical), 480
V depending on the frequency converter voltage rating.
With the proper fusing the frequency converter short
circuit current rating (SCCR) is 35,000 Arms.
Frame Size
Power [kW]
EATON
J1
0.37-2.2
Moller
PKZM0-16
J2
3.0-5.5
NZMN-1-A-25
J3
7.5
NZMN-1-A-32
J4
11-15
NZMN-1-A-50
J5
18.5-22
NZMN-1-A-80
J6
30-45
NZMN-1-A-160
J7
55-75
NZMN-1-A-250
Table 6.5 CE Circuit Breakers, 380-480 V, Frame Sizes J1-J7
Specifications
VLT
®
AutomationDrive FC 360 Design Guide
MG06B202 - VLT
®
is a registered Danfoss trademark
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